Illinois 1099 Tax Calculator 2026
Estimate your self-employment taxes as a Illinois freelancer or contractor. Includes SE tax (15.3%), the 50% SE deduction, federal income tax, and Illinois state income tax.
Net Annual Income
$57,210
after all taxes
| Net Income | 71.5% | $57,210 |
| Self-Employment Tax | 14.1% | $11,304 |
| Federal Income Tax | 9.4% | $7,527 |
| State Income Tax | 5.0% | $3,960 |
Estimates for 2026 tax year · For informational purposes only
How it's calculated
How 1099 self-employment tax works in Illinois for 2026
If you're paid on a 1099 as a freelancer or independent contractor, you owe self-employment (SE) tax on top of regular income tax — and this is where most first-year freelancers get surprised. SE tax is 15.3% (12.4% for Social Security plus 2.9% for Medicare) applied to 92.35% of your net earnings. Unlike a W-2 employee who splits FICA with an employer, you pay both halves yourself. This calculator applies 2026 federal brackets, your state income tax, and SE tax to your net freelance income so you can see your true after-tax number.
Two adjustments soften the blow. First, you deduct half of your SE tax (the "employer-equivalent" portion) above the line, which lowers your taxable income. Second, the Qualified Business Income (QBI) deduction under Section 199A can let eligible pass-through owners deduct up to 20% of qualified business income, subject to income thresholds. The Social Security portion of SE tax only applies up to the 2026 wage base of $184,500; the Medicare portion has no cap, and an extra 0.9% Additional Medicare Tax kicks in above $200,000 (single).
Because no employer withholds for you, the IRS expects quarterly estimated payments rather than a single April bill — see the quarterly estimator for due dates and safe-harbor rules. The practical takeaway: set aside roughly 25–30% of every invoice for federal SE and income tax, plus your state rate, and track deductible business expenses carefully, since they reduce both income tax and SE tax.
Illinois applies a flat 4.95% state income tax to taxable income, so every dollar of your self-employment income above the state's deduction is taxed at 4.95% on top of federal income tax and the 15.3% self-employment tax.
Frequently Asked Questions
How much should I set aside for taxes as a 1099 contractor? ▾
What is self-employment tax and why is it 15.3%? ▾
Does the 15.3% apply to all of my freelance income? ▾
Can I lower my 1099 taxes with deductions? ▾
How these numbers are calculated
Every figure here is computed from published 2026 tax rules for self-employed filers — not rounded estimates. Self-employment tax applies 15.3% (12.4% Social Security up to the $184,500 wage base + 2.9% Medicare with no cap) to 92.35% of net earnings, and half of that SE tax is deducted above the line. Federal income tax then uses the 2026 brackets and the $16,100 single / $32,200 married standard deduction.
Primary sources
- IRS Revenue Procedure 2025-32 — 2026 federal brackets, standard deduction, and inflation adjustments
- IRS — Self-Employment Tax — SE tax rate, the 92.35% base, and the 50% SE-tax deduction (Schedule SE)
- Social Security Administration — 2026 Social Security wage base
- Tax Foundation & state revenue departments — 2026 state income tax rates and brackets
Not tax advice. 1099Freelancer provides informational estimates based on standard self-employment tax rules and does not account for the QBI deduction, itemized deductions, retirement contributions, credits, or multiple income sources. For quarterly-payment or business decisions, verify with a CPA or enrolled agent. See our data & methodology.